Compact Wilkinson power divider with extensive suppression of harmonics, using a combination of trapezoidal, circular and rectangular resonators

Abstract

A low pass filtering power divider (LPFPD) with good isolation and extensive suppression of harmonics has been presented. In the design of the Wilkinson power divider, a new structure has been proposed by replacing two quarter wavelength stubs of the conventional Wilkinson power divider (CWPD) with a combination of trapezoidal, circular, and rectangular resonators. In this power divider, the undesired harmonics have been suppressed. The WPD has a miniaturized structure, which the normalized circuit size (NCS) is 0.1 λg × 0.08 λg and the operating frequency is located at 1.67 GHz. Ultimately, the power divider has been fabricated and tested. The return loss is about 28 dB and the isolation between the output ports is higher than 23 dB. The experimental results mimic the early design results. Thus, the proposed WPD has a good performance and can be used in many communication systems.